This name is a synonym of Salix divaricata var. metaformosa (Nakai) Kitag..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 28301292) with original publication details: Bot. Mag. (Tokyo) 33(387): 42–43 1919.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:778179-1.
This name was in version 1 of The Plant List, record tro-28301292, and has not been changed.